Step Two lists the attribute problem incidence rate for each attribute in a column next to
its gap score. (The percent of customers who experienced a problem with the service
attribute within the past 30 days). It will be important to take into account the rate at
which a problem with an attribute occurs within the customer base. It may be that a
particular attribute has a large gap score (and thereby a significant impact on overall
satisfaction), but the percent of customers reporting a problem with the attribute is
relatively small. In this case, it probably is not worth a transit agency's time and expense
to attempt to further lower the problem occurrence rate for the attribute. On the other
hand, if an attribute's gap score (impact on overall satisfaction) is moderately low, while
the rate at which customers experience a problem with the attribute is high, the effect of
the attribute on overall satisfaction is magnified and will require attention. Whether future
increases or decreases in problem incidence rates are statistically significant can be
validated by statistical tests (e.g., chi-square test, z-test of proportions, etc.).
Step Two lists the attribute problem incidence rate for each attribute in a column next toits gap score. (The percent of customers who experienced a problem with the serviceattribute within the past 30 days). It will be important to take into account the rate atwhich a problem with an attribute occurs within the customer base. It may be that aparticular attribute has a large gap score (and thereby a significant impact on overallsatisfaction), but the percent of customers reporting a problem with the attribute isrelatively small. In this case, it probably is not worth a transit agency's time and expenseto attempt to further lower the problem occurrence rate for the attribute. On the otherhand, if an attribute's gap score (impact on overall satisfaction) is moderately low, whilethe rate at which customers experience a problem with the attribute is high, the effect ofthe attribute on overall satisfaction is magnified and will require attention. Whether futureincreases or decreases in problem incidence rates are statistically significant can bevalidated by statistical tests (e.g., chi-square test, z-test of proportions, etc.).
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